文档介绍：Page ?1 LOGO Analysis on Classic Algorithms for Speech Enhancement Page ?2 LOGO Spectral Subtraction Spectral Subtraction Wiener Filter Wiener Filter Kalman Filter Kalman Filter Conclusion Page ?3 LOGO Spectral Subtraction Spectral Subtraction ? basic spectral subtraction ? improved spectral subtraction Page ?4 LOGO ?????? 2 2 2???NYS???????? tntst??y?????????NS??Y?????? 2 2 2???NSY?? FFT on the assu m ption that the speech are unattached to the noise basic spectral subtraction Page ?5 LOGO)(S??? 2?N ???Y The phase of is to be the phase of It is assumed that the noise is stable and the power spectrum of silence is used to estimate Page ?6 LOGO the illustrative diagram of spectral subtraction basic spectral subtraction Page ?7 LOGO basic spectral subtraction clean speech noisey speech filtered speech spectrogram of noisy speech spectrogram of clean speech spectrogram of filtered speech Page ?8 LOGO You can hear musical noise obviously. It has great influence on listening. basic spectral subtraction Page ?9 LOGO ? basic spectral subtraction ? improved spectral subtraction Spectral Subtraction Spectral Subtraction Page ? 10 LOGO improved spectral subtraction ?????????????N YS*??)(Y????S